Title :
Randomly selected spreading sequences for coded CDMA
Author :
Grant, Alex J. ; Alexander, Paul D.
Author_Institution :
Mobile Commun. Res. Centre, Univ. of South Australia, Pooraka, SA, Australia
Abstract :
We consider the effect of using randomly selected sequence multisets for the uplink of a code-division multiple-access channel. In particular, we calculate a tight lower bound on the expected value of the sum capacity, over the ensemble of randomly selected sequence multisets. We show that for large systems, the sum rate penalty for using randomly selected multisets is at most 1 nat, and vanishes, as the number of users becomes large, compared to the sequence length
Keywords :
binary sequences; channel capacity; code division multiple access; pseudonoise codes; spread spectrum communication; code-division multiple-access channel; coded CDMA; ight lower bound; randomly selected multisets; randomly selected spreading sequences; sum capacity; sum rate penalty; Australia; Baseband; Code division multiplexing; Decoding; Error correction; Mobile communication; Multiaccess communication; Network address translation; Random sequences; Viterbi algorithm;
Conference_Titel :
Spread Spectrum Techniques and Applications Proceedings, 1996., IEEE 4th International Symposium on
Conference_Location :
Mainz
Print_ISBN :
0-7803-3567-8
DOI :
10.1109/ISSSTA.1996.563742
